An introduction to macroeconomics /
Paul Wonnacott, Ronald Wonnacott.

APA Citation

Wonnacott, P., Wonnacott, R. J. (1979). An introduction to macroeconomics. New York: McGraw-Hill.

MLA Citation

Wonnacott, Paul, and Ronald J Wonnacott. An Introduction to Macroeconomics. New York: McGraw-Hill, 1979.

Warning: These citations may not always be complete (especially for serials).